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Property & finance

Mortgage amortisation calculator

Estimate the initial monthly payment from interest and amortisation.

Your result

Complete the fields and calculate.

Calculation method and formula

Loan amount × (Interest rate [%] + Initial amortisation [%]) ÷ 100 ÷ 12

Understand the inputs

Loan amount
Use a measured value or your own assumption.
Interest rate
Unit: %. Use a measured value or your own assumption.
Initial amortisation
Unit: %. Use a measured value or your own assumption.

Assumptions and limitations

The monthly payment is derived from initial annual interest and repayment rates. First-year figures are simplified and do not replace a monthly amortization schedule.

The formula uses the specified units. Displayed numbers are rounded; whole packs, item counts and full time periods may also be rounded within the calculation.

Worked example

Illustrative values. Replace them with your own inputs for your calculation.

Loan amount
280000
Interest rate
3.8 %
Initial amortisation
2 %
Example result1,353.33 per month

First year: about 5,600 principal and 10,640 interest.

Model revision: October 17, 2026 · How CleverCalc works

FAQ

Frequently asked questions

How does Mortgage amortisation calculator work?+

Loan amount × (Interest rate [%] + Initial amortisation [%]) ÷ 100 ÷ 12. The monthly payment is derived from initial annual interest and repayment rates. First-year figures are simplified and do not replace a monthly amortization schedule.

What assumptions should I consider for this result?+

The monthly payment is derived from initial annual interest and repayment rates. First-year figures are simplified and do not replace a monthly amortization schedule. The formula uses the specified units. Displayed numbers are rounded; whole packs, item counts and full time periods may also be rounded within the calculation.

How accurate is the result?+

The formula uses the specified units. Displayed numbers are rounded; whole packs, item counts and full time periods may also be rounded within the calculation. Prices, measurements and model assumptions determine how well the result represents your situation.

Is this calculator free?+

Yes. Calculations and PDF export work without an account or registration.

What happens to my inputs?+

Calculations run in your browser. Results are saved locally only when you add them to My results; favourites and history are also local. Shared links contain your values. The currency tool requests the selected currencies from its rate provider without sending your amount.

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